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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12fd8f6a6e1e4bb8e92c14df8faecd2e2c58a1d680db27b7571ff03107df9b1' 
  AND token = '0V0LexzaO7uCSeC/6WTbXYim9SD79Q6Ui3Z4vfHqWnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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