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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7715b76baf0e6e907e408acb0fb92800dbf471055791e8a84d2cb7affa0c43e9' 
  AND token = '5XbZWI8NKYGv5Gb9a+CH/KQUnljyQ413eIdq9cNMpYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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