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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5c150cdf74c055e1af7cadd99c761513594b172d4e34626b38d4a27b6c1d926' 
  AND token = 'b40ad3e+OylKaeQyIK+AJHccijydZhpEl+gzPPx6k+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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