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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ef847f011738ae0a5aa87a82f5a33f136da220a6ac1cc02ecf3cc2954bf942' 
  AND token = '3gaUOUWAwHiK/evYDNGUUCR1tvR83bS41Q7jM/zfKEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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