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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a916e9cbd7907a9b2e4f0939d4c09e4b971b3c8e0297fac2e54c2c513dc0be' 
  AND token = 'ChLCT61qgX06gI9d6SieO9Y5HiNwYC/pjJKIEOfdxG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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