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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635ca21c59d6a851ba9b9034a5732b755c51cf2a6b812ef967fa3bdbd53e0715' 
  AND token = 'zb7jt5V+/ju0A3RwWM1bwwpwtmvnuy1vTqUtNS6j/g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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