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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d4763b5244504cbdb08a0265bd8297e7ce6bd6ebd426987bf50d77189b2c6f' 
  AND token = 'G3AQFQveVg4JnHhjyul8wEr9RW4hyL5LIIar+5oOiwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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