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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d88e670076098a6be6a182bc0bb4be20068c17d45a589b4ee58b801434fe8f' 
  AND token = 'tia2WBBhEvi3cQGW575rWG9GT47X3Z/xSKjmcNuQEds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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