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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c2536f1293b1ea704736fc58381256482647fe0584cc3c4f1e2fda5f9c4eb9' 
  AND token = '7fgMrmr/i/6GymVSyiNf4zpTtHXD/t5JZYTKlYna40U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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