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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b97cae88a6d910cc5e4d6d8d14ac228ea96e498f79a3a1f0e668388c987c53' 
  AND token = 'SNzpNxuUT6e3DczhVfgpX2zm00iZ2J9pgsNPCaIXwnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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