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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab1c77d476a78c3c699a683d8824575d3b79d76d28ffc05411b1ce927b18ed7' 
  AND token = 'dBnsCWFR2rG78/QyQxYgRwrQUuxhFr3N0BJIBGhweD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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