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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473b33323fd6ab242fef61e28c9684d8d05f89cb167d9fa440ce4d0f9a4e0cd5' 
  AND token = 'ouOdoEQCe3Y2TV0OnlkNLim7MHG9f+WzGsR2NNXQ3kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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