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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7eac38cc6dddd71d26cc18cd72bf05fd415ed1ec38011e54e68966c79c45f1' 
  AND token = 'isS/83KNqEFKmLxr2tiQ6ro23qjxtwQheODFCNX4CEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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