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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3c0d1c0ed15c44cc9c87ea5395521a8c1c085f059a88d10b702119ff316d3b' 
  AND token = 'fqIKetEoufpIBCvim7Kc2YJHj0lmEYeXaTGw7i10MGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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