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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c2a1daf21a3407d4452f201a7bbfa196fce85c99ae1a0ba0e3bcda1fcba593' 
  AND token = 'IDxzkuuYCITnnFn6huJ0L/7tGsOUtIltcKQTEF/+jd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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