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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629dfe1f0a15d8aa16f28e2f3fcbf0be4841ef3ee9ab250ea724199700045429' 
  AND token = 'DGdHvz4dXP0lndF/F9k6gQ504bKxRqfwmPI1bkXS/gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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