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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9942c303f59debbc58cb9911b1d105f4f07cc239642d2b749f477fed23dab255' 
  AND token = 'MPZMD/Wbfdf1zrXkpoLttaGlh2q5WqIvBncm2mi20Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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