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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a6c6bcb0ef9f2677a2a42cf9fcf8800b74e0eaa8af7c8598a9621f3648a2ca' 
  AND token = '1YVf8aLSOYJ71/IB0ZScF88NcRwk6KPFyfR4o7BwOlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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