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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865b1392318b049186d78280b5f333cc9fbeab5195b4db20bd55f0dd07ee0b0d' 
  AND token = '52YZtRBI3JwLa6/+QT469j4ulql35KkIkLw+/z7Occw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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