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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90067f7073d3089f2c3fa69e8418d136ac82d2bd3b3eb1deec59d4f717747be3' 
  AND token = '02iDAOPnvAIr8Cau3YH0qHfc9JR2SnY9lxHG4J2qE+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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