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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b1c35bd5a22d50a97d5e72df4544420256db7308441bdda9f3ebce0fb410b4' 
  AND token = 'Lyqb4rw9y7BdUMe/oBO1rjNb24FAGm4m8kyiTE2SAU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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