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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a8f824210c74dc82880f7d105925948b582a1baf64a932be5ed2a8c7bfee00' 
  AND token = 'N6klXFhd1oKM3Htt6+PPKBhQIdUMWu8DkBMdqJMHUII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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