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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b25a099d557dc4702dbb3c588d3883e9bf0d78c3a04648cf5a5629f8723490dc' 
  AND token = 'lpUXZQhm8x6LF5YMX2PxgLySTqNoeE1e7fURJJ34qIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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