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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0569952c3718300cc04620f12c1696aa951fe5a3b67962ceb32417cfb0fe4888' 
  AND token = 'LBZ54syNjeVGaA6PqIm1Hj26UfRpBLt+BbrkLiJhu5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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