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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08622fc6e414165c62677b8842df5a00d8ba65b32d45a9b372c36eb493bc3f4a' 
  AND token = 'pG/zN6lRN4ewBYdssL+mUTojKURweo/LATCmt3l2lh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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