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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e40beaf94bbb9ffffb44acd9ce7630eab430aa55701fce600bf316c2d217d6b' 
  AND token = 'Dw1vzTyLl0PEWljPjYhP9bE5NM4o1obFtH8fGqFQgZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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