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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fb133eca0d0551b9c42cc343dcf3dfab6348f9e4b2196603df67c4eb9a6182' 
  AND token = 'GSXl8GE80ptRQJ+9pXsDyB+qTmylZ10Ce70BvRiwo50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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