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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be527ccabc01397a209fb0c569b34c5b3faaf6eb0cddee128c69f35274c7475d' 
  AND token = 'HpRt34+kn2pj2nlzXCepgz35wsbEci76wOR5vNSbbTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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