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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7273ff9257e1ca9796597a771739efb3ef68e4a6c8501e3afa569e5fb2bf7d8f' 
  AND token = '0RizObFKYPjntEV/O8r2O/Ypt6MVakfqJ1gL4zlWMIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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