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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606c1191d4e35fe5c772c6749404c42d0f8dcb251dab8545b23e4320ef52815a' 
  AND token = 'Na6Bb5LQukvjUC6XQ4LY7NRD8pvc3kpqLKS++4yUlYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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