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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e699f1c18611eb9ae33086e0556897b710e1cf7b1a474d2035ca8bb0df87722b' 
  AND token = '0sEmHGy0cs4xxwTswLjUxxP7ZjJNKCxAu+1pCaAufAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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