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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b3a29448cc359b6e7aa716353cabae51c751c7e18c3cc57110ea9b376e2607' 
  AND token = 'CYcFpCh7sRqPGbyC9USZVgzVcRGQUMkW8a5A1q2MSQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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