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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1123d95006b1edf94c597f7d888674cd7a0bea0afeb18594836a930e80a25a6' 
  AND token = 'x4aS8yPWe83884RgSrlOW1dwDWH3R1b4jY5uLdIslxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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