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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b4d95dcc6f2a5b7277919f40ea35ca8d4970b354361dd86db9dc4044364a21' 
  AND token = 'bm1qMy1uei0oNQ/V8Y7nRRQ+zDjyyqR5Mp2DYx78LSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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