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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd065bd0a931c0b9e77c15457e8fb4df48bdde5233b4a4bdffdf705aed4f387f7' 
  AND token = 'M9y2x7/9baV+gyYKdWUM5NpLVI+chclDFshkNXZwl/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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