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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ee7e732c6dccc46be0c8dd44c7f6c080ec28fdba28c02691e9b7c3be29946c' 
  AND token = 'bapdXq2BhDEFrZuW20fXJFUrkCdK+9ZwFG1zDXtHUpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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