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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50727fd1ffeeeec686dd8a8d1756d883a9fd7dac6fdd98b111af418979979970' 
  AND token = '//8VO31Su/QhmEPHzZBQPZUeNk4COFgf3M0dK01r19Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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