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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620c38787d26a603cd904f5b349dbdbc9f93de90ee3510c20bab03e48050c569' 
  AND token = 'DQ1miyHza50eT50tXFutl+TCY22QzPtxY4nMTBO7snY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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