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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2b9b1d20937d3faac12b18d95b938ff0096aacc0eced233393c83a54b11c74' 
  AND token = 'IgD4r7+o7gQsY9Dl6eHjzr5M6IhtWER1rhOgrwf0Po4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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