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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b237829fbbc4c9e5db8cd349619a4c06696e1170991b96db7f311c98bce89ce2' 
  AND token = 'HqmwgKG/Zh68TrcUVYzyT8MTU7oQWTyH88S9Eeq+WmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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