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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54de7acc5d5140b99a30423863dcbdcbf7fdf0b7cbe761a4eacbe00d0d5b463d' 
  AND token = '/MpszNdpNSiUtmlE1hqh0osN4a5VGhITvkKmoStd05s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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