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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74dbfe1194c68410f7e5ed957d9df4294ea5737fd8f594b2ca45bf476304376' 
  AND token = 'c3KplhBdyl4hZZvQsJUlyRMqonJocuJRtEZ/UAQxzTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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