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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90928ae732a37fc4a1c9d62b56ec8bf60fd8abff9d7b43029ff1f0fad1060cc3' 
  AND token = '87YJIM/qC0MW6swXCr5nBnHHNJaccKGBGF7E34x0XU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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