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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ceeec06c4831bd4445159f34bb12cdb8dfc9a72af7b29a41b62ba49cd391e4' 
  AND token = 'qGKDvREIcKnFxhmEkJwPgfHsU92wx11yh1qafc/oKZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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