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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1656f739556972e32d056618fda6c81d4e4f1128559af11c4037d5f26532766' 
  AND token = 't4KnBZp+9puA1Jk0XfxR2sRgzBcyywBOZJTuu0ntLgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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