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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c01d044c4d6333e00368a87d03ec94ea80c319077f5829b9143e4a289bb238' 
  AND token = 't7bopCWMbm+YgmQoM+KFe1WIMSIVEIukfXSbSnsLVUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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