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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a29a68d19347790ea1f68fec6e5375da695ecc03fc5b030c70f8ac78df1d36' 
  AND token = '4SYt8VVbnr9s+sYP0s8TdSTww/entSHWiV4j6C8SrHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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