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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367e696ec473f79a6813c25ef900b310a325e8a1038cb1fa666901f06273c7af' 
  AND token = 'ZRONv15EhdN16lmMgDyJveVtlmOzV9E6TUbLr/4KEPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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