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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d5d9fdfea9a708157633b18ea00302a3b899ff08db95f9a375633cf6584eab' 
  AND token = '7MOdkTjaReNw9EL+0zMGeTh00A3L9a1tJ2rGbpTb8jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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