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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2197cc36b869881160aa77793c056cd3a4d98bb8a1f24d051a2579cbe09567e7' 
  AND token = '1GeEd8VflHtFHE/z4LDfPbsqZ1N0iS8+fqkaVqpDhKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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