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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c19ef42fbcc87607a3cd00c8d7141145ca6994c9c752258a0b2e4870278adf' 
  AND token = 'G/2rIwDUbmMTDZhxiIT880n6N9D7RJ07iq5r8P6gVNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}