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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b22ddc37f7f6b2852fbfb8d3d56c6f1ee86ddc6ea194b5f9ca84c01027dce7' 
  AND token = '6mJp9HsAPS7wAxhtVu100gjiEywZwu2SteP75cSEL4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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