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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ffc9ebdda4fe9a7a20878444c7b86cb842e7829d708dd1cdc59ad1a31b9f88' 
  AND token = '1brNZGbnDl2Q1XH2fafjYhyn6mKmg7BAbgeCOI5tcDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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