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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28d5688d0e51170f000b6f0b417f59e8937c68e86da0fca4c86f774874de8f3' 
  AND token = 'v6gqkNVPaFpU+akWZIRWd6UHELyoJcOPJl2JUkM3y48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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