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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b37234c7798accfba4574c76484c832c6981ac1c9cd61b3b71f50cf50b32466' 
  AND token = '7B2uPcgNT8R6F4PwlaNQ31J2O7Sd/fl+dOd0qfSitlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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