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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d4d03ef7f784117d28af1ff9f887bde3eca837758565f96aeb046c4c462569' 
  AND token = 'gleeUaHLKpMsq6iDSPFczGveqlYWhhRLtuGayi6a2QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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