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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa9552671a6c80224311ed1b5c288f15ffc7bf43306379e4e57fbe76c50c7a2' 
  AND token = 'QjxTy2050+RAGHt43CSkEcNalUSpR2CDYJM9M0HFvCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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