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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bb1c5932671648975734f74d94fab9257817d59450758bd866ea2428a62a5a' 
  AND token = 'fY6tGexI2MZCbpS9rjuK9/ovbr7GxkeddCj/VWWQnhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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