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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356073dc2edbc44a7dd6a316a211507c226bc6c999af5a39dc8340a3d8e7abda' 
  AND token = '+T0nafs7UAlVYSj3N7fZLjo/ogPW5a2N0wikOBIbzS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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