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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317154cc697653b32a4ad3c5e7228445672283eeb80118e178dd710336aee4e5' 
  AND token = 'qllXySiZ1G7LOn6UtzL4IY2rDuaAGc4ICOeZCP/wbNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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