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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8441553a00cc1135b84f21628a868ab093f11cc708bd50e11db388fa239c12ac' 
  AND token = 'gS8osPjWKeBt2kYpSulJaq2OOGfpEuChEVUc12YJizI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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