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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0912fd5837e5c58843ba63811df2f21abdc8e66bcba2f8c1524952da6ee0cfb3' 
  AND token = '6EtrMA4nm5TWhrDZzuPOn3DTz9Df8pYfjvWMaXTdhSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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