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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52908872576db7edd2631fddab1313b14f0e467398ce5bd918af79cf432d3804' 
  AND token = 'OCa6mu9pyBxhF5PzS1tL53zaG6K0WW+9WdClCPfupA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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