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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85613e202b4454aa439468df33a5d2e8e86666ef0a11d72652d203bb6b96f9aa' 
  AND token = 'xAyk8OgiSdOB+gDaNFAbK92Gt6IzFOLz03ML8x4TBLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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