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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5aa2c294325646cf7ee81e0c8f2be0aed0386abcfa17cb069da0b8fe730d8d' 
  AND token = 'ZhpGOvSMdVE5KcMOv0LoZw3Ge/rTqOfKcTSEvUr1JHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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